Safety device for detonator cord



Feb. 16, SEAVEY SAFETY DEvCE FOR DETONATOR CORD Filed May 1 1962 

1. A CONNECTING DEVICE FOR CONNECTING TWO LENGTHS OF DETONATOR CORD AND PERMITTING DETONATION BETWEEN THE TWO LENGTHS IN ONLY ONE DIRECTION COMPRISING A TUBULAR SHELL HAVING AN INNER DIAMETER SUBSTANTIALLY EQUAL TO THE OUTER DIAMETER OF THE DETONATOR CORD AND A UNIDIRECTIONAL DETONATING UNIT POSITIONED WITHIN SAID SHELL CONSISTING ESSENTIALLY OF IN THE DIRECTION OF DETONATION A BAFFLE SECTION AND A DETONATING CHARGE SECTION, SAID SHELL HAVING A SUFFICIENT LENGTH TO PROVIDE ON EACH SIDE OF SAID DETONATING UNIT A SPACE ADAPTED FOR THE INSERTION OF A LENGTH OF DETONATOR CORD, SAID BAFFLE SECTION CONSISTING ESSENTIALLY OF A FIRST BARRIER, SAID DETONATING CHARGE SECTION COMPRISING IN SEQUENCE ARRANGED ADJACENT EACH OTHER IN THE DIRECTION OF DETONATION AN EXPLOSIVE INITIATING CHARGE, A SECONDARY EXPLOSIVE CHARGE AND A SECOND BARRIER, SAID FIRST BARRIER AND SAID INITIATING CHARGE BEING SPACED APART TO DEFINE THEREBETWEEN AN ENCLOSED AIR GAP EXTENDING FROM SAID FIRST BARRIER TO SAID INITIATING CHARGE, SAID FIRST BARRIER BEING RUPTURABLE BY THE DETONATION OF A DETONATOR CORD ADJACENT THERETO TO TRANSMIT SUFFICIENT DETONATING ENERGY FROM THE REACTION OF A DETONATOR CORD ADJACENT SAID FIRST BARRIER ACROSS SAID AIR GAP TO DETONATE SAID INITIATING CHARGE, THE AXIAL DISTANCE OCCUPIED BY SAID AIR GAP BEING SUFFICIENT TO PREVENT THE TRANSMISSION OF SUFFICIENT DETONATING ENERGY FROM THE REACTION OF THE INITIATING AND SECONDARY CHARGES ACRSS THE AIR GAP TO DETONATE A DETONATOR CORD ADJACENT TO THE FIRST BARRIER. 